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Been doing some research on propane heaters such as the ceiling mounted hang down units by Modine & Reznor. I'm leaning toward Reznor as they seem to make a very high quality heater with very few problems.
I've got a 26' x 32' garage with 12' ceiling. I use the garage for some wood working as well as wrenching. That means some saw dust, paint fumes and other solvents.....not that often but on ocassion.
I've been told I should go with a sealed combustion unit. Those bad boys cost 2X as much and the duct work is also quite expensive. Reznor's UDAS units have sealed combustion while their UDAP units are not. The sealed are about $1,300 while the non-sealed are about $600.
Anybody have some thoughts on this. Obviously I'd rather not blow myself and my newly built garage into the heavens!

You heading in the right direction. Any fumes or dust will get sucked in and burtn and that includes paint and fuel. If you're in a heating situation, that is, doors closed, no circulation of air, it will go thru the heater.

I went sealed with a Radiant tube heater and not having to worry about using anything corrosive, or fumes with petroleum distillates, wood dust is very comforting. It is really cheap and easy to add afresh air intake for radiant tube. It adds maybe $50.00

I just won a new Reznor Udas 60k btu heater on ebay for $1080 which is about $200 less than the cheapest I've seen on line. There may be some other sizes of the UDAS units available.

Tom

Hey Tom, which ebay seller did you buy from. What is the size of the area you are heating (insulated or not) and how cold are your winters as I'm trying to decide between a 45K & 60K unit. My winters are pretty cold as I'm in NY.

I just ordered a Sterling Garage Guy 45K with the seperated combustion and all the duct work and chimney cap set up for under $800 delivered! So we'll see. It just arrived thursday.The company was super fast on the shipping.I ordered Monday and got it all on thursday.http://www.littlegreenhouse.com/acce...heaters4.shtml

As soon as my plumber gets my gas line hooked up we'll get it going.
If you search the forum there is someone that has one of these that has had good luck with it.They also have a few pics of it installed.

My area is 32 x 28 with 12' ceilings. There is also a 32 x 12 attic with 7' ceilings. The area is (will be!) fully insulated at r19 and r30+. I'm in MD near PA so it can get cold but I would say it's moderately cold. ebay seller - I'll have to get back on that.